/*
 * Copyright (C) 2011 Freescale Semiconductor Inc.
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#define LOG_TAG "LightSensor"
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <poll.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/select.h>
#include <cutils/log.h>
#include <cutils/properties.h>

#include "LightSensor.h"
#define LIGSENSOR_DATA_NAME    ligSensorInfo.sensorName

/*****************************************************************************/
    LightSensor::LightSensor()
: SensorBase(NULL, LIGSENSOR_DATA_NAME),
    mEnabled(0),
    mInputReader(4),
    mThresholdLux(10),
    mPendingMask(0)
{
    char  buffer[PROPERTY_VALUE_MAX];
    memset(&mPendingEvent, 0, sizeof(mPendingEvent));

    mPendingEvent.version = sizeof(sensors_event_t);
    mPendingEvent.sensor = ID_L;
    mPendingEvent.type = SENSOR_TYPE_LIGHT;
    memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));

    property_get("ro.lightsensor.threshold", buffer, "10");
    mThresholdLux = atoi(buffer);

#ifdef SENSOR_DEBUG
    ALOGD("%s:data_fd:%d\n", __func__,data_fd);
#endif

}

LightSensor::~LightSensor() {
    if (mEnabled) {
        setEnable(ID_L, 0);
    }
}

int LightSensor::setDelay(int32_t handle, int64_t ns)
{
    if(ligSensorInfo.classPath[0] == ICHAR)
        return -1;

    if (ns > 10240000000LL) {
        ns = 10240000000LL; /* maximum delay in nano second. */
    }
    if (ns < 312500LL) {
        ns = 312500LL; /* minimum delay in nano second. */
    }

    char buf[80];
    int bytes = sprintf(buf, "%lld", ns/1000 / 1000);


    int err = set_sysfs_input_attr(ligSensorInfo.classPath,"ls_poll_delay",buf,bytes);


    return 0;
}

int LightSensor::setEnable(int32_t handle, int en)
{
    char buf[2];
    int err = -1;

    if(ligSensorInfo.classPath[0] == ICHAR)
        return -1;

    int flags = en ? 1 : 0;

    if (flags != mEnabled) {
        int bytes = sprintf(buf, "%d", flags);
        err = set_sysfs_input_attr(ligSensorInfo.classPath,"enable",buf,bytes);
        mEnabled = flags;
    }

    return 0;
}
#if 0
int LightSensor::setIntLux()
{
    FILE *fd = NULL;
    char buf[6];
    int n, lux, int_ht_lux, int_lt_lux;

    /* Read current lux value firstly, then change Delta value */
    strcpy(&ls_sysfs_path[ls_sysfs_path_len], "lux");
    if ((fd = fopen(ls_sysfs_path, "r")) == NULL) {
        ALOGE("Unable to open %s\n", ls_sysfs_path);
        return -1;
    }
    memset(buf, 0, 6);

    if ((n = fread(buf, 1, 6, fd)) < 0) {
        ALOGE("Unable to read %s\n", ls_sysfs_path);
        return -1;
    }
    fclose(fd);

    lux = atoi(buf);
    int_ht_lux = lux + mThresholdLux;
    int_lt_lux = lux - mThresholdLux;
    DEBUG("Current light is %d lux\n", lux);

    /* Set low lux and high interrupt lux for polling */
    strcpy(&ls_sysfs_path[ls_sysfs_path_len], "int_lt_lux");

    fd = fopen(ls_sysfs_path, "r+");
    if (fd) {
        memset(buf, 0, 6);
        snprintf(buf, 6, "%d", int_lt_lux);
        n = fwrite(buf, 1, 6, fd);
        fclose(fd);
    } else
        ALOGE("Couldn't open %s file\n", ls_sysfs_path);

    strcpy(&ls_sysfs_path[ls_sysfs_path_len], "int_ht_lux");
    fd = fopen(ls_sysfs_path, "r+");

    if (fd) {
        memset(buf, 0, 6);
        snprintf(buf, 6, "%d", int_ht_lux);
        n = fwrite(buf, 1, 6, fd);
        fclose(fd);
    } else
        ALOGE("Couldn't open %s file\n", ls_sysfs_path);

    return 0;
}
#endif

int LightSensor::readEvents(sensors_event_t* data, int count)
{
    if (count < 1)
        return -EINVAL;

    ssize_t n = mInputReader.fill(data_fd);
    if (n < 0)
        return n;

    int numEventReceived = 0;
    input_event const* event;

    while (count && mInputReader.readEvent(&event)) {
        int type = event->type;

        if ((type == EV_ABS) || (type == EV_REL) || (type == EV_KEY)) {
            processEvent(event->code, event->value);
            mInputReader.next();
        } else if (type == EV_SYN) {
            int64_t time = timevalToNano(event->time);

            if (mPendingMask) {
                mPendingMask = 0;
                mPendingEvent.timestamp = time;

                if (mEnabled) {
                    *data++ = mPendingEvent;
                    count--;
                    numEventReceived++;
                    mPreviousLight = mPendingEvent.light;
                }
            }

            if (!mPendingMask) {
                mInputReader.next();
            }

        } else {
            ALOGE("AccelSensor: unknown event (type=%d, code=%d)",
                  type, event->code);
            mInputReader.next();
        }
    }

    return numEventReceived;
}

void LightSensor::processEvent(int code, int value) {

    if (code == EVENT_TYPE_LIGHT) {
        mPendingMask = 1;
        mPendingEvent.light = value;

#ifdef SENSOR_DEBUG
        ALOGD("light value: %f\n", mPendingEvent.light);
#endif
        //setIntLux();
    }


}
